MY 2002 GILERA DNA 125CC 4STROKE MAKING POPPING NOISES FROM EXHAUST AND CUTS OUT AFTER 10MINS OF RIDING IT

MY 2002 GILERA DNA 125CC 4STROKE I WAS RUNNING FINE THEN ALL OF A SUDDEN I WAS ON WAY TO TAKE IT FOR MOT WITHIN 15-20MINS OF RIDING IT STARTED MAKING LIKE A POPPING NOISE FROM EXHAUST AND LOSING POWER AND JERKING AND THEN CUT OUT AND WOULDN'T START LEFT IT FOR 10MINS THEN STARTED IT BUT IT STILL DOES THE SAME THING ANY IDEAS AND IT DOES IT WHEN THE TEMPERATURE GOES UP...I'VE GOT THE SPARK PLUG CHANGED, NEW BATTERY, AND GOT THE CARB CLEANED STILL SAME THING HAPPENING HELP PLEASE

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Re: MY 2002 GILERA DNA 125CC 4STROKE MAKING POPPING...

Hi, Darren and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Air/fuel mixture screw improperly adjusted.
11. Accelerator pump damaged or not working.
12. Water or dirt in the fuel system, carburetor or filter.
13. Restricted, blocked or kinked fuel line.
14. Fuel tank empty.
15. The gas cap is not venting properly or fuel tank venting system blocked.
16. A failed fuel pump, pressure regulator and or fuel injectors.
17. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
18. Needle and seat stuck closed in the float bowl.
19. Lean angle switch is faulty or needs adjustment.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.https://www.o2w.co.uk/tagforum/viewtopic.php?t=9147http://www.100-biker.com/forums/showthread.php?t=248242001 Gilera DNA 125 Scooter PDF Factory Service Work Shop Manual Download... $22Gilera DNA 125 180 125 2001 Partshttps://en.wikipedia.org/wiki/Gilera_DNA

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Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it and clean it. With the gas valve turned off, does gas still get past the valve? If it does, then you need to replace the valve. Re-mount the bowl, ( not all bikes have a water trap bowl ). Always turn the gas off when not riding the bike. If the valve will not fully shut off the gas then a leak-down condition can occur and cause gas to get to the exhaust pipe.Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.< < READ CLOSELY > >Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.Please rate this solution. Thanks!

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